id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
20993	filtering with F(), then count()ing throws a pickle ValueError	Artscoop <artscoop93.info@…>	nobody	"This

{{{
results = self.only('id').filter(user=user, topic__isnull=False, date__gte=F('topic__updated'))
}}}

works, but


{{{
total = self.only('id').filter(user=user, topic__isnull=False, date__gte=F('topic__updated')).count()
}}}

does not, and fails with a **ValueError : ctypes objects containing pointers cannot be pickled**. `aggregate()`, `values_list()` and `annotate()` also fail with the same error. `date` and `topic__updated` are `DateTimeField`s."	Uncategorized	closed	Database layer (models, ORM)	1.5	Normal	duplicate			Unreviewed	0	0	0	0	0	0